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The average radius of gyration (one third times the trace)
Rg of a triaxial ellipsoid is simply [50]:
Rg2 = (1/5) [a2+b2+c2]
(6)
where a,b,c are the three semi-axis lengths. Calculating Rg for an ellipsoid of revolution, c = b, and normalizing by
Rg for the sphere of equal volume gives
